Hi where's the best place to get GBB guns serviced and repaired. Got a G&P WOC M4 that spat an oring into the breach the other day an nobody seems to know what to do with it or be able to give it a service. Any help would be really appreciated.
How big is the o-ring? Could you send a picture? I can likely diagnose as I've worked on a lot of them. There are only a few potential issues that could have that sort of symptom, and all are easily repairable with the right spare part.